slowly... if you deploy all at once you will fall out of the SERPs pretty quickly... normal websites don't grow like that. It probably costs google $50 in resources to process all of that so that is exactly the kind of thing they would want to flag for scrutiny.

I developed a site last year which started with 600,000 pages full of content and media. I generated a multi-part sitemap with 50,000 pages per XML file and submitted it in Webmasters Tools. Took Google about three weeks but it crawled everything eventually.

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